CA2966685A1 - Polyurethane material, process for preparing such material and protective cover for wind turbine blade - Google Patents
Polyurethane material, process for preparing such material and protective cover for wind turbine blade Download PDFInfo
- Publication number
- CA2966685A1 CA2966685A1 CA2966685A CA2966685A CA2966685A1 CA 2966685 A1 CA2966685 A1 CA 2966685A1 CA 2966685 A CA2966685 A CA 2966685A CA 2966685 A CA2966685 A CA 2966685A CA 2966685 A1 CA2966685 A1 CA 2966685A1
- Authority
- CA
- Canada
- Prior art keywords
- protective cover
- preformed protective
- wind turbine
- turbine blade
- preformed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 134
- 239000000463 material Substances 0.000 title claims abstract description 44
- 239000004814 polyurethane Substances 0.000 title claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title description 6
- 239000012948 isocyanate Substances 0.000 claims abstract description 34
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 34
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229920005862 polyol Polymers 0.000 claims abstract description 29
- 150000003077 polyols Chemical class 0.000 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims abstract description 26
- 230000003247 decreasing effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 45
- 239000000853 adhesive Substances 0.000 claims description 22
- 230000001070 adhesive effect Effects 0.000 claims description 22
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 14
- 238000005496 tempering Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 238000007872 degassing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000049 pigment Substances 0.000 claims description 7
- 238000011417 postcuring Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical class C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 230000000875 corresponding effect Effects 0.000 claims 1
- 230000003628 erosive effect Effects 0.000 description 38
- 239000010410 layer Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 230000010354 integration Effects 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- ADLSWZDEMJETGK-UHFFFAOYSA-N I.I.I.I.I.I.I.I.I.I.I Chemical compound I.I.I.I.I.I.I.I.I.I.I ADLSWZDEMJETGK-UHFFFAOYSA-N 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- XXSCONYSQQLHTH-UHFFFAOYSA-N 9h-fluoren-9-ylmethanol Chemical compound C1=CC=C2C(CO)C3=CC=CC=C3C2=C1 XXSCONYSQQLHTH-UHFFFAOYSA-N 0.000 description 1
- 101150067539 AMBP gene Proteins 0.000 description 1
- 206010059837 Adhesion Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000543381 Cliftonia monophylla Species 0.000 description 1
- 241000784713 Cupido Species 0.000 description 1
- 238000003722 High energy mechanical milling Methods 0.000 description 1
- 108010093488 His-His-His-His-His-His Proteins 0.000 description 1
- GARLKHGYOJAPHX-UHFFFAOYSA-N I.I.I.I.I.I.I.I.I.I Chemical compound I.I.I.I.I.I.I.I.I.I GARLKHGYOJAPHX-UHFFFAOYSA-N 0.000 description 1
- 101100055110 Microbacterium testaceum (strain StLB037) aiiM gene Proteins 0.000 description 1
- FOIOMXVHOQOYHR-UHFFFAOYSA-N N.N.N.N.N.N.N.N.N.N.N Chemical compound N.N.N.N.N.N.N.N.N.N.N FOIOMXVHOQOYHR-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 206010042255 Struck by lightning Diseases 0.000 description 1
- 241000341910 Vesta Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000019571 color Nutrition 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6511—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38 compounds of group C08G18/3203
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
- C08J5/124—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives using adhesives based on a macromolecular component
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0025—Producing blades or the like, e.g. blades for turbines, propellers, or wings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/30—Lightning protection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/20—Manufacture essentially without removing material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/20—Manufacture essentially without removing material
- F05B2230/23—Manufacture essentially without removing material by permanently joining parts together
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/40—Heat treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/40—Organic materials
- F05B2280/4003—Synthetic polymers, e.g. plastics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/40—Organic materials
- F05B2280/4011—Organic materials not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Wind Motors (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Polyurethanes Or Polyureas (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The polyurethane material is prepared from a polyol, butanediol, and an isocyanate. The protective cover (1) is adapted to be attached along at least a part of a longitudi- nal edge (3) of the wind turbine blade by adhesion of an inside (4) of the protective cover to a surface (5) of the longitudinal edge of the wind turbine blade. The protective cover is elongated in a longitudinal direction (D) and has an at least substantially U- formed cross-section. The protective cover includes a central cover section extending in the longitudinal direction and two peripheral cover sections extending in the longitu- dinal direction at either side of the central cover section, respectively. The central cov- er section has a minimum thickness of at least 1 millimetre, and each peripheral cover section has a thickness decreasing from a maximum thickness of at least 1 millimetre to a minimum thickness of less than 1/2 millimetre.
Description
PCT/IB 2015/058 674 - 30.11.2016 The present invention relates to a preformed protective cover for a wind turbine blade, the preformed protective cover being made of a polyurethane material.
The polyurethane material is characterised by being prepared from a polyol, butanedi-ol, and an isocyanate.
In an embodiment, the isocyanate is an optionally modified diphenylmethane 4,4'-diisocyanate.
In an embodiment, the butanediol is 1,4-butanediol.
In an embodiment, the polyurethane material comprises an UV stabilisator and/or col-our pigment(s).
The present invention further relates to a process for preparing a polyurethane, char-acterised by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), c) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item.
The present invention further relates to a process for preparing a protective cover for a wind turbine blade, characterised by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), C) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item.
In an embodiment, in the polyurethane material or the process, the tempering accord-ing to b) and/or c) is carried out at a temperature from 30 C to 50 C.
AMENDED SHEET
152163/LO/MF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
The polyurethane material is characterised by being prepared from a polyol, butanedi-ol, and an isocyanate.
In an embodiment, the isocyanate is an optionally modified diphenylmethane 4,4'-diisocyanate.
In an embodiment, the butanediol is 1,4-butanediol.
In an embodiment, the polyurethane material comprises an UV stabilisator and/or col-our pigment(s).
The present invention further relates to a process for preparing a polyurethane, char-acterised by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), c) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item.
The present invention further relates to a process for preparing a protective cover for a wind turbine blade, characterised by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), C) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item.
In an embodiment, in the polyurethane material or the process, the tempering accord-ing to b) and/or c) is carried out at a temperature from 30 C to 50 C.
AMENDED SHEET
152163/LO/MF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
2 In an embodiment, in the polyurethane material or the process, the tempering accord-ing to b) and/or c) is carried out at a temperature about 40 C.
In an embodiment, the mould in step d) is preheated.
In an embodiment, the mould in step d) is preheated to a temperature from 90 C
to 120 C.
In an embodiment, the mould in step d) is preheated to a temperature about 100 C.
In an embodiment, wherein the curing in step e) is carried out at a temperature from 90 C to 120 C.
In an embodiment, the curing in step e) is carried out at a temperature of about 100 C.
In an embodiment, the curing in step e) is carried out for about 15 minutes.
In an embodiment, the process comprises a further step:
g) post-curing.
In an embodiment, the post-curing in step g) takes place in about 12 hours at a tem-perature of about 100 C.
In an embodiment, in the polyurethane material or the process, the polyol, butanediol, and isocyanate are used in a ratio by weight polyol:butanediol:isocyanate of 100:(3 to 5):(30 to 35).
In an embodiment, in the polyurethane material or the process, the polyol, butanediol, and isocyanate are used in a ratio by weight polyol:butanediol:isocyanate of 100:4:32.3.
In an embodiment, in the polyurethane material or the process, the polyol comprises an UV stabilisator and/or colour pigment(s).
AMENDED SHEET
152160/LOW ¨ amended specification (dean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
In an embodiment, the mould in step d) is preheated.
In an embodiment, the mould in step d) is preheated to a temperature from 90 C
to 120 C.
In an embodiment, the mould in step d) is preheated to a temperature about 100 C.
In an embodiment, wherein the curing in step e) is carried out at a temperature from 90 C to 120 C.
In an embodiment, the curing in step e) is carried out at a temperature of about 100 C.
In an embodiment, the curing in step e) is carried out for about 15 minutes.
In an embodiment, the process comprises a further step:
g) post-curing.
In an embodiment, the post-curing in step g) takes place in about 12 hours at a tem-perature of about 100 C.
In an embodiment, in the polyurethane material or the process, the polyol, butanediol, and isocyanate are used in a ratio by weight polyol:butanediol:isocyanate of 100:(3 to 5):(30 to 35).
In an embodiment, in the polyurethane material or the process, the polyol, butanediol, and isocyanate are used in a ratio by weight polyol:butanediol:isocyanate of 100:4:32.3.
In an embodiment, in the polyurethane material or the process, the polyol comprises an UV stabilisator and/or colour pigment(s).
AMENDED SHEET
152160/LOW ¨ amended specification (dean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
3 In an embodiment, in the polyurethane material or the process, the polyol is Bayflexe OS 380-A-59A.
In an embodiment, in the polyurethane material or the process, the isocyanate is DESMODUR PF.
In an embodiment, in the polyurethane material or the process, butanediol is 1,4-butanediol.
The present invention furthermore relates to a preformed protective cover for a wind turbine blade.
EP 0 037 987 A2 (Messerschmitt-Bolkow-Blohm Gesellschaft) discloses a nose cover and a rear end cover for wings, rotor blades, etc.
WO 2004/076852 A2 (Vestas Wind Systems NS) describes a front edge cover that is preformed to fit a wind turbine blade and subsequently adhered to the blade.
WO 2010/122157 Al (Hempel A/S) discloses a specific chemical composition of a polyurethane coating.
US 2013/045105 Al discloses a turbine blade for a wind turbine includes a leading edge, a trailing edge and a recess located within the leading edge. The blade further includes a protective layer having an inner side and outer side, the inner side is sized and orientated to locate within the recess to facilitate withstanding impact forces ap-plied by an object.
However, according to prior art methods, it has been difficult to obtain good results.
One object of the present invention is to provide an improved preformed protective cover for a wind turbine blade.
In view of this object, the preformed protective cover is made of a made of a polyure-thane material prepared from a polyol, butanediol, and an isocyanate, the preformed protective cover is adapted to be attached along at least a part of a longitudinal edge of the wind turbine blade by adhesion of an inside of the preformed protective cover to AMENDED SHEET
152160/L01MF ¨ amended specification 1clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
In an embodiment, in the polyurethane material or the process, the isocyanate is DESMODUR PF.
In an embodiment, in the polyurethane material or the process, butanediol is 1,4-butanediol.
The present invention furthermore relates to a preformed protective cover for a wind turbine blade.
EP 0 037 987 A2 (Messerschmitt-Bolkow-Blohm Gesellschaft) discloses a nose cover and a rear end cover for wings, rotor blades, etc.
WO 2004/076852 A2 (Vestas Wind Systems NS) describes a front edge cover that is preformed to fit a wind turbine blade and subsequently adhered to the blade.
WO 2010/122157 Al (Hempel A/S) discloses a specific chemical composition of a polyurethane coating.
US 2013/045105 Al discloses a turbine blade for a wind turbine includes a leading edge, a trailing edge and a recess located within the leading edge. The blade further includes a protective layer having an inner side and outer side, the inner side is sized and orientated to locate within the recess to facilitate withstanding impact forces ap-plied by an object.
However, according to prior art methods, it has been difficult to obtain good results.
One object of the present invention is to provide an improved preformed protective cover for a wind turbine blade.
In view of this object, the preformed protective cover is made of a made of a polyure-thane material prepared from a polyol, butanediol, and an isocyanate, the preformed protective cover is adapted to be attached along at least a part of a longitudinal edge of the wind turbine blade by adhesion of an inside of the preformed protective cover to AMENDED SHEET
152160/L01MF ¨ amended specification 1clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
4 a surface of the longitudinal edge of the wind turbine blade, the preformed protective cover is elongated in a longitudinal direction and has an at least substantially U-formed cross-section, the preformed protective cover includes a central cover section extend-ing in the longitudinal direction and two peripheral cover sections extending in the Ion-gitudinal direction at either side of the central cover section, respectively, the central cover section has a minimum thickness of at least 1 millimetre, and each peripheral cover section has a thickness decreasing from a maximum thickness of at least 1 mil-limetre to a minimum thickness of less than 1/2 millimetre.
Advantageous embodiments of the preformed protective cover are described below.
In an embodiment, the maximum thickness of each peripheral cover section corre-sponds to the minimum thickness of the central cover section.
In an embodiment, the minimum thickness of the central cover section is at least 2 millimetres, preferably at least 3 millimetres, more preferred at least 4 millimetres and most preferred approximately 5 millimetres.
In an embodiment, the thickness of the central cover section is at least substantially constant from side to side of the central cover section.
In an embodiment, the minimum thickness of each peripheral cover section is less than 1/3 millimetre, preferably less than 1/5 millimetres, more preferred less than 1/7 millimetres and most preferred approximately 1/10 millimetres.
In an embodiment, each peripheral cover section has a thickness decreasing at least substantially constantly from its maximum thickness to its minimum thickness.
In an embodiment, the width of each peripheral cover section is at least 3 per cent, preferably at least 7 per cent, more preferred at least 12 per cent and most preferred at least 15 per cent of the total width of the preformed protective cover.
In an embodiment, the total width of the preformed protective cover is at least 30 mil-limetres, preferably at least 50 millimetres, more preferred at least 100 millimetres and most preferred approximately 150 to 250 millimetres.
AMENDED SHEET
152160/LO/MF ¨ amended specification (clean vers on) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016 In an embodiment, the total width of the preformed protective cover increases in the longitudinal direction.
In an embodiment, the inside of the preformed protective cover is provided with a
Advantageous embodiments of the preformed protective cover are described below.
In an embodiment, the maximum thickness of each peripheral cover section corre-sponds to the minimum thickness of the central cover section.
In an embodiment, the minimum thickness of the central cover section is at least 2 millimetres, preferably at least 3 millimetres, more preferred at least 4 millimetres and most preferred approximately 5 millimetres.
In an embodiment, the thickness of the central cover section is at least substantially constant from side to side of the central cover section.
In an embodiment, the minimum thickness of each peripheral cover section is less than 1/3 millimetre, preferably less than 1/5 millimetres, more preferred less than 1/7 millimetres and most preferred approximately 1/10 millimetres.
In an embodiment, each peripheral cover section has a thickness decreasing at least substantially constantly from its maximum thickness to its minimum thickness.
In an embodiment, the width of each peripheral cover section is at least 3 per cent, preferably at least 7 per cent, more preferred at least 12 per cent and most preferred at least 15 per cent of the total width of the preformed protective cover.
In an embodiment, the total width of the preformed protective cover is at least 30 mil-limetres, preferably at least 50 millimetres, more preferred at least 100 millimetres and most preferred approximately 150 to 250 millimetres.
AMENDED SHEET
152160/LO/MF ¨ amended specification (clean vers on) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016 In an embodiment, the total width of the preformed protective cover increases in the longitudinal direction.
In an embodiment, the inside of the preformed protective cover is provided with a
5 number of protrusions having a height of between 1/2 and 2 millimetres, preferably approximately 1 millimetre.
In an embodiment, the preformed protective cover has a symmetry axis extending in the longitudinal direction, and wherein the inside of the preformed protective cover at either side of the symmetry axis is provided with a number of spaced elongated pro-trusions extending with an oblique angle in relation to the longitudinal direction.
The invention further relates to a wind turbine blade including a preformed protective cover as described above, wherein the preformed protective cover is attached along at least a part of a longitudinal edge of the wind turbine blade by adhesion to a surface of the longitudinal edge of the wind turbine blade.
In an embodiment, the wind turbine blade includes a first blade shell and a second blade shell joined together to form a wind turbine blade along a first longitudinal joint at a leading edge of the wind turbine blade and along a second longitudinal joint at a trail-ing edge of the wind turbine blade, and wherein the preformed protective cover is at-tached at least approximately symmetrical about the first or second longitudinal joint, and preferably about the first longitudinal joint.
The invention furthermore relates to a method of providing a wind turbine blade with a preformed protective cover as described above. The preformed protective cover is attached along at least a part of a longitudinal edge of the wind turbine blade by adhe-sion of the inside of the preformed protective cover to a surface of the longitudinal edge of the wind turbine blade, whereby the adhesion is performed by the following steps:
= providing an adhesive, such as a two component polyurethane adhesive, on the inside of the preformed protective cover, = pressing the inside of the preformed protective cover against the surface of the longitudinal edge of the wind turbine blade, and = removing excess adhesive leaking between each peripheral cover section and the surface of the longitudinal edge of the wind turbine blade.
AMENDED SHEET
152160/1.0/MF¨ amended soecificalion (clean version) - 30111-2016 PCT/IB 2015/058 674 - 30.11.2016
In an embodiment, the preformed protective cover has a symmetry axis extending in the longitudinal direction, and wherein the inside of the preformed protective cover at either side of the symmetry axis is provided with a number of spaced elongated pro-trusions extending with an oblique angle in relation to the longitudinal direction.
The invention further relates to a wind turbine blade including a preformed protective cover as described above, wherein the preformed protective cover is attached along at least a part of a longitudinal edge of the wind turbine blade by adhesion to a surface of the longitudinal edge of the wind turbine blade.
In an embodiment, the wind turbine blade includes a first blade shell and a second blade shell joined together to form a wind turbine blade along a first longitudinal joint at a leading edge of the wind turbine blade and along a second longitudinal joint at a trail-ing edge of the wind turbine blade, and wherein the preformed protective cover is at-tached at least approximately symmetrical about the first or second longitudinal joint, and preferably about the first longitudinal joint.
The invention furthermore relates to a method of providing a wind turbine blade with a preformed protective cover as described above. The preformed protective cover is attached along at least a part of a longitudinal edge of the wind turbine blade by adhe-sion of the inside of the preformed protective cover to a surface of the longitudinal edge of the wind turbine blade, whereby the adhesion is performed by the following steps:
= providing an adhesive, such as a two component polyurethane adhesive, on the inside of the preformed protective cover, = pressing the inside of the preformed protective cover against the surface of the longitudinal edge of the wind turbine blade, and = removing excess adhesive leaking between each peripheral cover section and the surface of the longitudinal edge of the wind turbine blade.
AMENDED SHEET
152160/1.0/MF¨ amended soecificalion (clean version) - 30111-2016 PCT/IB 2015/058 674 - 30.11.2016
6 Advantageous embodiments of the method are described below.
In an embodiment, the adhesive is provided as string of adhesive on the inside of the preformed protective cover at least substantially along a longitudinal symmetry axis of the preformed protective cover.
In an embodiment, the preformed protective cover is produced by the following steps:
= providing a male form part having a geometry resembling or at least substan-tially matching the outer geometry of the at least part of the longitudinal edge of the wind turbine blade, = providing a female form part having a geometry matching the male form part, but being slightly larger, = closing the male form part against the female form part thereby forming a form cavity, = pouring the adhesive into the form cavity, and = opening the form cavity by separating the male form part from the female form part and ejecting the moulded preformed protective cover.
In an embodiment, the wind turbine blade is provided with the preformed protective cover as a repair operation, whereby an area of said surface of the longitudinal edge of the wind turbine blade corresponding to the preformed protective cover is machined, such as by grinding or milling, before attachment of the preformed protective cover.
In an embodiment, the wind turbine blade is provided with the preformed protective cover when the wind turbine blade is still mounted on a wind turbine.
In an embodiment, the preformed protective cover as described above is made of a polymer material in the form of a polyurethane material as defined or as prepared in any one of the above embodiments.
In an embodiment, a wind turbine blade includes said preformed protective cover made of a polymer material in the form of a polyurethane material as defined in or as prepared in any one of the above embodiments.
AMENDED SHEET
152160/L00AF ¨ amended specification (clean version) ¨ 30111-2016 PCT/IB 2015/058 674 - 30.11.2016
In an embodiment, the adhesive is provided as string of adhesive on the inside of the preformed protective cover at least substantially along a longitudinal symmetry axis of the preformed protective cover.
In an embodiment, the preformed protective cover is produced by the following steps:
= providing a male form part having a geometry resembling or at least substan-tially matching the outer geometry of the at least part of the longitudinal edge of the wind turbine blade, = providing a female form part having a geometry matching the male form part, but being slightly larger, = closing the male form part against the female form part thereby forming a form cavity, = pouring the adhesive into the form cavity, and = opening the form cavity by separating the male form part from the female form part and ejecting the moulded preformed protective cover.
In an embodiment, the wind turbine blade is provided with the preformed protective cover as a repair operation, whereby an area of said surface of the longitudinal edge of the wind turbine blade corresponding to the preformed protective cover is machined, such as by grinding or milling, before attachment of the preformed protective cover.
In an embodiment, the wind turbine blade is provided with the preformed protective cover when the wind turbine blade is still mounted on a wind turbine.
In an embodiment, the preformed protective cover as described above is made of a polymer material in the form of a polyurethane material as defined or as prepared in any one of the above embodiments.
In an embodiment, a wind turbine blade includes said preformed protective cover made of a polymer material in the form of a polyurethane material as defined in or as prepared in any one of the above embodiments.
AMENDED SHEET
152160/L00AF ¨ amended specification (clean version) ¨ 30111-2016 PCT/IB 2015/058 674 - 30.11.2016
7 In an embodiment of a method of providing a wind turbine blade with a preformed pro-tective cover, said preformed protective cover is made of a polymer material in the form of a polyurethane material as defined in or as prepared in any one of the above embodiments.
A second invention furthermore relates to a method of making a wind turbine blade component incorporating an integrated lightning protection enhancement, leading edge protection, aerodynamic enhancement and de-ice system, the method compris-es:
providing the over moulding of a one piece novel polyurethane material to the blade tip region, the said material completely covering the outer surface of the blade leading edge, the said material covering the interface between the blade shell laminate and the solid metal tip lightning receptor; the integration of a novel polyurethane die-lectric and aerodynamic fence at the interface between the blade shell laminate and the solid metal tip lightning receptor; further aerodynamic fences integrated at opti-mised positions chord-wise on the blade; integration of a novel composite heating lay-er to the leading edge of the blade; and integration of a lightning receptor component for the protection of the said de-ice layer.
In an embodiment of the second invention, the novel polyurethane material is a polyu-rethane material as defined in or as prepared in any one of the above embodiments.
Technical field of the second invention The present invention relates to an integrated system as part of a wind turbine blade structure and associated fabrication processes for improving the resilience of wind turbine blades to all or a subset of lightning strikes, leading edge environmental ero-sion, aerodynamic enhancement and blade icing. The invention also extends to the specific composition and properties of the associated materials used in the said sys-tern in addition to the application and fabrication process.
Background of the second invention Wind turbines are operated in extreme environmental conditions where the wind tur-bine blades in particular are vulnerable to leading edge erosion, lightning strike and icing.
AMENDED SHEET
152160/LOIMF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
A second invention furthermore relates to a method of making a wind turbine blade component incorporating an integrated lightning protection enhancement, leading edge protection, aerodynamic enhancement and de-ice system, the method compris-es:
providing the over moulding of a one piece novel polyurethane material to the blade tip region, the said material completely covering the outer surface of the blade leading edge, the said material covering the interface between the blade shell laminate and the solid metal tip lightning receptor; the integration of a novel polyurethane die-lectric and aerodynamic fence at the interface between the blade shell laminate and the solid metal tip lightning receptor; further aerodynamic fences integrated at opti-mised positions chord-wise on the blade; integration of a novel composite heating lay-er to the leading edge of the blade; and integration of a lightning receptor component for the protection of the said de-ice layer.
In an embodiment of the second invention, the novel polyurethane material is a polyu-rethane material as defined in or as prepared in any one of the above embodiments.
Technical field of the second invention The present invention relates to an integrated system as part of a wind turbine blade structure and associated fabrication processes for improving the resilience of wind turbine blades to all or a subset of lightning strikes, leading edge environmental ero-sion, aerodynamic enhancement and blade icing. The invention also extends to the specific composition and properties of the associated materials used in the said sys-tern in addition to the application and fabrication process.
Background of the second invention Wind turbines are operated in extreme environmental conditions where the wind tur-bine blades in particular are vulnerable to leading edge erosion, lightning strike and icing.
AMENDED SHEET
152160/LOIMF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
8 A lightning strike event has the potential to cause physical damage to the turbine blade structure. Leading edge erosion has the possibility to cause physical damage to the leading edge of the blade. Blade icing causes the wind turbine to be shut down for extended periods.
Accordingly, in recent years much effort has been made by wind turbine manufactur-ers to improve the robustness of wind turbine blades so that they are able to operate effectively in the environment in order to avoid damage to the blade and the cost as-sociated with turbine down-time during blade repair/replacement.
In general, lightning protection systems for wind turbine blades are known, so to are methods for improving the robustness of the leading edge to erosion, and various sys-tems exist for de-icing the blade. However, the protection requirements for the current discrete protection systems are often mutually exclusive and at this time there is no known protection system that can protect a wind turbine blade against the effects of lightning, leading edge erosion and de-icing simultaneously.
It is against this context that the second invention has been devised.
Summary of the second invention In a first aspect, the second invention comprising: providing the over moulding of a one piece novel polyurethane material to the blade tip region; the said material completely covering the outer surface of the blade leading edge; the said material covering the interface between the blade shell laminate and the solid metal tip lightning receptor;
the integration of a novel polyurethane dielectric and aerodynamic fence at the inter-face between the blade shell laminate and the solid metal tip lightning receptor; further aerodynamic fences integrated at optimised positions chord-wise on the blade;
inte-gration of a novel composite heating later to the leading edge of the blade;
integration of a lightning receptor component for the protection of the said de-ice layer.
The aerodynamic and dielectric fence components could be pre-cast using the novel polyurethane material with optimised mechanical, environmental and electrical proper-ties in the precise geometry dictated by the turbine blade outer geometry.
AMENDED SHEET
152160fLO/MF ¨ amended specification (c,ean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
Accordingly, in recent years much effort has been made by wind turbine manufactur-ers to improve the robustness of wind turbine blades so that they are able to operate effectively in the environment in order to avoid damage to the blade and the cost as-sociated with turbine down-time during blade repair/replacement.
In general, lightning protection systems for wind turbine blades are known, so to are methods for improving the robustness of the leading edge to erosion, and various sys-tems exist for de-icing the blade. However, the protection requirements for the current discrete protection systems are often mutually exclusive and at this time there is no known protection system that can protect a wind turbine blade against the effects of lightning, leading edge erosion and de-icing simultaneously.
It is against this context that the second invention has been devised.
Summary of the second invention In a first aspect, the second invention comprising: providing the over moulding of a one piece novel polyurethane material to the blade tip region; the said material completely covering the outer surface of the blade leading edge; the said material covering the interface between the blade shell laminate and the solid metal tip lightning receptor;
the integration of a novel polyurethane dielectric and aerodynamic fence at the inter-face between the blade shell laminate and the solid metal tip lightning receptor; further aerodynamic fences integrated at optimised positions chord-wise on the blade;
inte-gration of a novel composite heating later to the leading edge of the blade;
integration of a lightning receptor component for the protection of the said de-ice layer.
The aerodynamic and dielectric fence components could be pre-cast using the novel polyurethane material with optimised mechanical, environmental and electrical proper-ties in the precise geometry dictated by the turbine blade outer geometry.
AMENDED SHEET
152160fLO/MF ¨ amended specification (c,ean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
9 The de-ice heating layer and associated lightning protection layer can be applied to a preformed polyurethane substrate.
Then, the preformed components of the system are loaded into the novel associated automated tooling developed as part of this invention. The tooling is so designed to fabricate the protection system onto the turbine blade in either a one stage or two stage process depending on whether all or a subset of the elements of the system are employed.
The automated tooling is then located and clamped around the tip end of the wind tur-bine blade in question. This operation shall be performed as part of the finish operation in a blade factory or on an existing blade that has been removed from the wind turbine for maintenance.
The automated tooling then fabricates the complete protection system onto the wind turbine blade and remains in place until the process has completed and the protection system is fully cured and bonded to the blade shell. No further finish operations are required unless the end user requires the system to be painted as part of the normal blade paint process.
When the protection system requires the inclusion of the de-ice sub-system, the asso-ciated power and control sub-system shall be installed in the wind turbine blade prior to the aforementioned blade finish operation.
The dielectric / aerodynamic fence at the interface between the blade shell laminate and solid metal tip lightning receptor has three novel functions; Firstly, the material forms an environmental protection layer covering the leading edge interface between the solid metal tip lightning receptor and the blade laminate in order to protect the said interface from erosion due to rain and other particulates experienced during normal operation. Secondly, the dielectric fence, which is positioned over the interface and runs chord-wise adjacent to the solid metal tip receptor, with a vertical extent at a de-fined angle to the blade surface prevents the lightning strike arc root from attaching to a position on the said solid metal tip receptor that would normally cause localized heat damage to the blade shell laminate, thus improving the robustness of the protection system. Third, the vertical extent of the fence with novel geometry reduces the blade drag by partially recovering the tip vortex energy, thus improving efficiency.
AMENDED SHEET
152160/LO/MF ¨ amended specific,ation (clean version) ¨30111-2016 PCT/IB 2015/058 674 - 30.11.2016 The novel polyurethane material positioned completely around the leading edge of the wind turbine blade and comprising the absolute outer surface of the said blade pro-tects the blade from leading edge erosion.
The de-ice heating layer is situated directly below the leading edge protection layer at the leading edge of the blade and extends towards the windward and leeward sides of the said blade. The heating layer comprises a novel thin layer carbon composite and polyurethane material, which can be heated by either direct ohmic heating or indirect
Then, the preformed components of the system are loaded into the novel associated automated tooling developed as part of this invention. The tooling is so designed to fabricate the protection system onto the turbine blade in either a one stage or two stage process depending on whether all or a subset of the elements of the system are employed.
The automated tooling is then located and clamped around the tip end of the wind tur-bine blade in question. This operation shall be performed as part of the finish operation in a blade factory or on an existing blade that has been removed from the wind turbine for maintenance.
The automated tooling then fabricates the complete protection system onto the wind turbine blade and remains in place until the process has completed and the protection system is fully cured and bonded to the blade shell. No further finish operations are required unless the end user requires the system to be painted as part of the normal blade paint process.
When the protection system requires the inclusion of the de-ice sub-system, the asso-ciated power and control sub-system shall be installed in the wind turbine blade prior to the aforementioned blade finish operation.
The dielectric / aerodynamic fence at the interface between the blade shell laminate and solid metal tip lightning receptor has three novel functions; Firstly, the material forms an environmental protection layer covering the leading edge interface between the solid metal tip lightning receptor and the blade laminate in order to protect the said interface from erosion due to rain and other particulates experienced during normal operation. Secondly, the dielectric fence, which is positioned over the interface and runs chord-wise adjacent to the solid metal tip receptor, with a vertical extent at a de-fined angle to the blade surface prevents the lightning strike arc root from attaching to a position on the said solid metal tip receptor that would normally cause localized heat damage to the blade shell laminate, thus improving the robustness of the protection system. Third, the vertical extent of the fence with novel geometry reduces the blade drag by partially recovering the tip vortex energy, thus improving efficiency.
AMENDED SHEET
152160/LO/MF ¨ amended specific,ation (clean version) ¨30111-2016 PCT/IB 2015/058 674 - 30.11.2016 The novel polyurethane material positioned completely around the leading edge of the wind turbine blade and comprising the absolute outer surface of the said blade pro-tects the blade from leading edge erosion.
The de-ice heating layer is situated directly below the leading edge protection layer at the leading edge of the blade and extends towards the windward and leeward sides of the said blade. The heating layer comprises a novel thin layer carbon composite and polyurethane material, which can be heated by either direct ohmic heating or indirect
10 radio frequency radiation depending on which specific technology shall be deployed. If the ohmic heating method is employed then the power transfer system and associated lightning protection guard band is integrated into the polyurethane substrate and posi-tioned in such a way that the lighting protection prevents damage to the heating sys-tem during a lightning event. The said heating layer increases in temperature during operation and provides a rapid uniform surface temperature increase at the leading edge of the blade either preventing the formation of ice or melting and shedding al-ready formed ice depending on he strategy of the control system employed.
The system is fabricated to the blade using an automated moulding process to ensure robust adherence to the blade structure without the need for additional adhesive and manual process.
It will be appreciated that preferred and/or optional features of the first aspect of the second invention may be combined with the other aspects of the invention, and vice versa.
The invention will now be explained in more detail below by means of examples of embodiments with reference to the very schematic drawing, in which Fig. 1 illustrates a cross-section through a wind turbine blade and a preformed protec-tive cover before attachment to the wind turbine blade, Fig. 2 illustrates on a larger scale a cross-section through the preformed protective cover of Fig. 1, and Fig. 3 illustrates the preformed protective cover of Fig. 1 seen from its inside.
AMENDED SHEET
152160/L0/MF - amended specrficalion (clean version) - 30111-2016 PCT/IB 2015/058 674 - 30.11.2016
The system is fabricated to the blade using an automated moulding process to ensure robust adherence to the blade structure without the need for additional adhesive and manual process.
It will be appreciated that preferred and/or optional features of the first aspect of the second invention may be combined with the other aspects of the invention, and vice versa.
The invention will now be explained in more detail below by means of examples of embodiments with reference to the very schematic drawing, in which Fig. 1 illustrates a cross-section through a wind turbine blade and a preformed protec-tive cover before attachment to the wind turbine blade, Fig. 2 illustrates on a larger scale a cross-section through the preformed protective cover of Fig. 1, and Fig. 3 illustrates the preformed protective cover of Fig. 1 seen from its inside.
AMENDED SHEET
152160/L0/MF - amended specrficalion (clean version) - 30111-2016 PCT/IB 2015/058 674 - 30.11.2016
11 Fig. 1 shows a preformed protective cover 1 for a wind turbine blade 2, wherein the preformed protective cover 1 is made of a polymer material, such as a polyether based polyurethane. The preformed protective cover 1 is adapted to be attached along at least a part of a longitudinal edge 3 of the wind turbine blade 2 by adhesion of an in-side 4 of the preformed protective cover 1 to a surface 5 of the longitudinal edge 3 of the wind turbine blade 2. The preformed protective cover 1 is elongated in a longitudi-nal direction D and has an at least substantially U-formed cross-section. The pre-formed protective cover 1 includes a central cover section 6 extending in the longitudi-nal direction D and two peripheral cover sections 7 extending in the longitudinal direc-tion at either side of the central cover section 6, respectively. The central cover section 6 has a minimum thickness of at least 1 millimetre, and each peripheral cover section 7 has a thickness decreasing from a maximum thickness of at least 1 millimetre to a minimum thickness of less than 1/2 millimetre.
The particular form of the peripheral cover sections 7 provides for a good transition from the central cover section of the preformed protective cover 1 to the surface of the wind turbine blade 2. A good transition without edges is of great importance in order to avoid that the wind will destroy the materials. A sealing material (sealer) may be ap-plied in a possible groove between an edge of the peripheral cover sections 7 and the surface of the wind turbine blade 2 in order to even further improve the transition.
The maximum thickness of each peripheral cover section 7 may correspond to the minimum thickness of the central cover section. The minimum thickness of the central cover section may be at least 2 millimetres, preferably at least 3 millimetres, more pre-ferred at least 4 millimetres and most preferred approximately 5 millimetres.
The thickness of the central cover section 6 may be at least substantially constant from side to side of the central cover section.
The minimum thickness of each peripheral cover section 7 may be less than 1/3 milli-metre, preferably less than 1/5 millimetres, more preferred less than 1/7 millimetres and most preferred approximately 1/10 millimetres.
Each peripheral cover section 7 may have a thickness decreasing at least substantially constantly from its maximum thickness to its minimum thickness.
AMENDED SHEET
152160/L0/MF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
The particular form of the peripheral cover sections 7 provides for a good transition from the central cover section of the preformed protective cover 1 to the surface of the wind turbine blade 2. A good transition without edges is of great importance in order to avoid that the wind will destroy the materials. A sealing material (sealer) may be ap-plied in a possible groove between an edge of the peripheral cover sections 7 and the surface of the wind turbine blade 2 in order to even further improve the transition.
The maximum thickness of each peripheral cover section 7 may correspond to the minimum thickness of the central cover section. The minimum thickness of the central cover section may be at least 2 millimetres, preferably at least 3 millimetres, more pre-ferred at least 4 millimetres and most preferred approximately 5 millimetres.
The thickness of the central cover section 6 may be at least substantially constant from side to side of the central cover section.
The minimum thickness of each peripheral cover section 7 may be less than 1/3 milli-metre, preferably less than 1/5 millimetres, more preferred less than 1/7 millimetres and most preferred approximately 1/10 millimetres.
Each peripheral cover section 7 may have a thickness decreasing at least substantially constantly from its maximum thickness to its minimum thickness.
AMENDED SHEET
152160/L0/MF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
12 The width of each peripheral cover section 7 may be at least 3 per cent, preferably at least 7 per cent, more preferred at least 12 per cent and most preferred at least 15 per cent of the total width of the preformed protective cover.
The total width of the preformed protective cover 1 may be at least 30 millimetres, preferably at least 50 millimetres, more preferred at least 100 millimetres and most preferred approximately 150 to 250 millimetres.
The total width of the preformed protective cover 1 may increase in the longitudinal direction as illustrated in Fig. 3.
The inside of the preformed protective cover 1 may be provided with a number of not shown protrusions having a height of between 1/2 and 2 millimetres, preferably ap-proximately 1 millimetre. Such not shown protrusions may have the function of ensur-ing an appropriate layer thickness of adhesive between the preformed protective cover 1 and the surface of the wind turbine blade 2.
The preformed protective cover may have a symmetry axis 8 extending in the longitu-dinal direction D. The inside of the preformed protective cover 1 at either side of the symmetry axis may be provided with a number of not shown spaced elongated protru-sions extending with an oblique angle in relation to the longitudinal direction. Such not shown protrusions may in addition to the above-mentioned function have the function of leading the adhesive appropriately from the area around the symmetry axis 8 to the area of the peripheral cover sections 7.
As seen in Fig. 1, the preformed protective cover 1 is adapted to be attached along at least a part of the longitudinal edge 3 of the wind turbine blade 2 by adhesion to the surface 5 of the longitudinal edge of the wind turbine blade.
The wind turbine blade 2 may include a first blade shell 9 and a second blade shell 10 joined together to form 2 wind turbine blade along a first longitudinal joint 11 at a lead-ing edge 13 of the wind turbine blade and along a second longitudinal joint 12 at a trailing edge 14 of the wind turbine blade. The preformed protective cover 1 may be attached at least approximately symmetrical about the first or second longitudinal joint 11, 12, and preferably about the first longitudinal joint 11.
AMENDED SHEET
152160/LOIMF ¨ amended specification (clean version) ¨30111-2016 PCT/IB 2015/058 674 - 30.11.2016
The total width of the preformed protective cover 1 may be at least 30 millimetres, preferably at least 50 millimetres, more preferred at least 100 millimetres and most preferred approximately 150 to 250 millimetres.
The total width of the preformed protective cover 1 may increase in the longitudinal direction as illustrated in Fig. 3.
The inside of the preformed protective cover 1 may be provided with a number of not shown protrusions having a height of between 1/2 and 2 millimetres, preferably ap-proximately 1 millimetre. Such not shown protrusions may have the function of ensur-ing an appropriate layer thickness of adhesive between the preformed protective cover 1 and the surface of the wind turbine blade 2.
The preformed protective cover may have a symmetry axis 8 extending in the longitu-dinal direction D. The inside of the preformed protective cover 1 at either side of the symmetry axis may be provided with a number of not shown spaced elongated protru-sions extending with an oblique angle in relation to the longitudinal direction. Such not shown protrusions may in addition to the above-mentioned function have the function of leading the adhesive appropriately from the area around the symmetry axis 8 to the area of the peripheral cover sections 7.
As seen in Fig. 1, the preformed protective cover 1 is adapted to be attached along at least a part of the longitudinal edge 3 of the wind turbine blade 2 by adhesion to the surface 5 of the longitudinal edge of the wind turbine blade.
The wind turbine blade 2 may include a first blade shell 9 and a second blade shell 10 joined together to form 2 wind turbine blade along a first longitudinal joint 11 at a lead-ing edge 13 of the wind turbine blade and along a second longitudinal joint 12 at a trailing edge 14 of the wind turbine blade. The preformed protective cover 1 may be attached at least approximately symmetrical about the first or second longitudinal joint 11, 12, and preferably about the first longitudinal joint 11.
AMENDED SHEET
152160/LOIMF ¨ amended specification (clean version) ¨30111-2016 PCT/IB 2015/058 674 - 30.11.2016
13 According to a method of providing a wind turbine blade with a preformed protective cover according to the invention, the preformed protective cover 1 is attached along at least a part of a longitudinal edge 3 of the wind turbine blade 2 by adhesion of the in-side 4 of the preformed protective cover to a surface 5 of the longitudinal edge of the wind turbine blade. The adhesion is performed by the following steps:
= providing an adhesive, such as a two component polyurethane adhesive, on the inside 4 of the preformed protective cover 1, = pressing the inside 4 of the preformed protective cover 1 against the surface 5 of the longitudinal edge 3 of the wind turbine blade 2, and = removing excess adhesive leaking between each peripheral cover section 7 and the surface 5 of the longitudinal edge 3 of the wind turbine blade 2.
The inside 4 of the preformed protective cover 1 may be pressed against the surface 5 of the longitudinal edge 3 of the wind turbine blade 2 by means of a special tool. For instance, a tools may have a form corresponding to the outside of the preformed pro-tective cover 1 and may be slid along the outside of the preformed protective cover in order to make the preformed protective cover fit as good as possible onto the wind turbine blade.
The adhesive may be provided as string of adhesive on the inside 5 of the preformed protective cover 1 at least substantially along the longitudinal symmetry axis 8 of the preformed protective cover 1. By subsequently positioning the protective cover 1 on the wind turbine blade 2 and pressing on the protective cover 1 substantially along the longitudinal symmetry axis 8, the adhesive may be pressed in the direction of the pe-ripheral cover sections 7 and thereby be suitably distributed.
The preformed protective cover 1 may be produced by the following steps:
= providing a not shown male form part having a geometry resembling or at least substantially matching the outer geometry of the at least part of the longitudinal edge 3 of the wind turbine blade 2, = providing a not shown female form part having a geometry matching the male form part, but being slightly larger, = closing the male form part against the female form part thereby forming a form cavity, = pouring the adhesive into the form cavity, and AMENDED SHEET
152160/LO/MF ¨ amended specification {clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
= providing an adhesive, such as a two component polyurethane adhesive, on the inside 4 of the preformed protective cover 1, = pressing the inside 4 of the preformed protective cover 1 against the surface 5 of the longitudinal edge 3 of the wind turbine blade 2, and = removing excess adhesive leaking between each peripheral cover section 7 and the surface 5 of the longitudinal edge 3 of the wind turbine blade 2.
The inside 4 of the preformed protective cover 1 may be pressed against the surface 5 of the longitudinal edge 3 of the wind turbine blade 2 by means of a special tool. For instance, a tools may have a form corresponding to the outside of the preformed pro-tective cover 1 and may be slid along the outside of the preformed protective cover in order to make the preformed protective cover fit as good as possible onto the wind turbine blade.
The adhesive may be provided as string of adhesive on the inside 5 of the preformed protective cover 1 at least substantially along the longitudinal symmetry axis 8 of the preformed protective cover 1. By subsequently positioning the protective cover 1 on the wind turbine blade 2 and pressing on the protective cover 1 substantially along the longitudinal symmetry axis 8, the adhesive may be pressed in the direction of the pe-ripheral cover sections 7 and thereby be suitably distributed.
The preformed protective cover 1 may be produced by the following steps:
= providing a not shown male form part having a geometry resembling or at least substantially matching the outer geometry of the at least part of the longitudinal edge 3 of the wind turbine blade 2, = providing a not shown female form part having a geometry matching the male form part, but being slightly larger, = closing the male form part against the female form part thereby forming a form cavity, = pouring the adhesive into the form cavity, and AMENDED SHEET
152160/LO/MF ¨ amended specification {clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
14 = opening the form cavity by separating the male form part from the female form part and ejecting the moulded preformed protective cover 1.
The wind turbine blade 2 may be provided with the preformed protective cover 1 as a repair operation, whereby an area of said surface 5 of the longitudinal edge 3 of the wind turbine blade 2 corresponding to the preformed protective cover 1 is machined, such as by grinding or milling, before attachment of the preformed protective cover 1.
The wind turbine blade 2 may be provided with the preformed protective cover 1 when the wind turbine blade 2 is still mounted on a wind turbine.
Thereby, according to the invention, a damaged wind turbine blade 2 may be repaired in an advantageous way.
The polyurethane material is prepared from a polyol, butanediol, and an isocyanate.
The isocyanate may be an optionally modified diphenylmethane 4,4'-diisocyanate. The butanediol may be 1,4-butanediol. The polyurethane material may comprise an UV
stabilisator and/or colour pigment(s).
The protective cover for a wind turbine blade may be prepared by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), c) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item.
The tempering according to b) and/or c) may be carried out at a temperature from 30 C to 50 C. The tempering according to b) and/or c) may be carried out at a tem-perature about 40 C. The mould in step d) may be preheated. The mould in step d) may be preheated to a temperature from 90 C to 120 C. The mould in step d) may be preheated to a temperature about 100 C. The curing in step e) may be carried out at a temperature from 90 C to 120 C. The curing in step e) may be carried out at a tem-perature of about 100 C. The curing in step e) may be carried out for about 15 minutes. The process may comprise a further step: g) post-curing. The post-curing in AMENDED SHEET
152160/LO/MF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016 step g) may take place in about 12 hours at a temperature of about 100 C. The polyu-rethane material or the process, the polyol, butanediol, and isocyanate may be used in a ratio by weight polyol:butanediol:isocyanate of 100:(3 to 5):(30 to 35).
The polyol, butanediol, and isocyanate may be used in a ratio by weight polyol:butane-5 diol:isocyanate of 100:4:32.3. The polyol comprises an UV stabilisator and/or colour pigment(s). The polyol may be Bayflex0 OS 380-A-59A. The isocyanate may be DESMODUR PF. Butanediol may be 1,4-butanediol.
Comparative examples:
10 To elucidate the Rain Erosion (RE) durability of the polyurethane material according to the present invention, the durability of the material has been compared to other prod-ucts.
Annex A illustrates the result of a so-called rain erosion test performed on a sample
The wind turbine blade 2 may be provided with the preformed protective cover 1 as a repair operation, whereby an area of said surface 5 of the longitudinal edge 3 of the wind turbine blade 2 corresponding to the preformed protective cover 1 is machined, such as by grinding or milling, before attachment of the preformed protective cover 1.
The wind turbine blade 2 may be provided with the preformed protective cover 1 when the wind turbine blade 2 is still mounted on a wind turbine.
Thereby, according to the invention, a damaged wind turbine blade 2 may be repaired in an advantageous way.
The polyurethane material is prepared from a polyol, butanediol, and an isocyanate.
The isocyanate may be an optionally modified diphenylmethane 4,4'-diisocyanate. The butanediol may be 1,4-butanediol. The polyurethane material may comprise an UV
stabilisator and/or colour pigment(s).
The protective cover for a wind turbine blade may be prepared by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), c) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item.
The tempering according to b) and/or c) may be carried out at a temperature from 30 C to 50 C. The tempering according to b) and/or c) may be carried out at a tem-perature about 40 C. The mould in step d) may be preheated. The mould in step d) may be preheated to a temperature from 90 C to 120 C. The mould in step d) may be preheated to a temperature about 100 C. The curing in step e) may be carried out at a temperature from 90 C to 120 C. The curing in step e) may be carried out at a tem-perature of about 100 C. The curing in step e) may be carried out for about 15 minutes. The process may comprise a further step: g) post-curing. The post-curing in AMENDED SHEET
152160/LO/MF ¨ amended specification (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016 step g) may take place in about 12 hours at a temperature of about 100 C. The polyu-rethane material or the process, the polyol, butanediol, and isocyanate may be used in a ratio by weight polyol:butanediol:isocyanate of 100:(3 to 5):(30 to 35).
The polyol, butanediol, and isocyanate may be used in a ratio by weight polyol:butane-5 diol:isocyanate of 100:4:32.3. The polyol comprises an UV stabilisator and/or colour pigment(s). The polyol may be Bayflex0 OS 380-A-59A. The isocyanate may be DESMODUR PF. Butanediol may be 1,4-butanediol.
Comparative examples:
10 To elucidate the Rain Erosion (RE) durability of the polyurethane material according to the present invention, the durability of the material has been compared to other prod-ucts.
Annex A illustrates the result of a so-called rain erosion test performed on a sample
15 part of a protective cover for a wind turbine blade made of the polyurethane material according to the present invention. The test has been performed according to ASTM
G73-10.
Annex A-1 illustrates the sample part on a larger scale, before start of the test.
Annex A-2 illustrates the sample part at nine different stages of the test.
"UV" indicates the number of hours the sample part has been exposed to UV light. "RE"
indicates the number of hours the sample part has been exposed to the simulated rain erosion.
Annex A-3 illustrates the sample part at the end of the test. The sample part has been exposed to UV light for 573 hours and has been exposed to the simulated rain erosion for 40 hours. It is seen that no erosion is visible.
Annex B illustrates the result of a rain erosion test performed on a sample part of a protective cover for a wind turbine blade (Blade no. 1); said protective cover not being made of the polyurethane material according to the present invention. The test has been performed according to ASTM G73-10.
Annex B-3 illustrates the sample part before start of the test.
Annex B-4 illustrates the sample part when it has been exposed to the simulated rain erosion for 0.5 hours. It is seen that no erosion is visible.
Annex B-5 illustrates the sample part when it has been exposed to the simulated rain erosion for 1 hour. It is seen that severe erosion is visible.
Annex B-6 illustrates the sample part when it has been exposed to the simulated rain erosion for 5.0 hours. It is seen that severe erosion is visible.
AMENDED SHEET
1521601LO/MF ¨ amended spe:ificat ol (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
G73-10.
Annex A-1 illustrates the sample part on a larger scale, before start of the test.
Annex A-2 illustrates the sample part at nine different stages of the test.
"UV" indicates the number of hours the sample part has been exposed to UV light. "RE"
indicates the number of hours the sample part has been exposed to the simulated rain erosion.
Annex A-3 illustrates the sample part at the end of the test. The sample part has been exposed to UV light for 573 hours and has been exposed to the simulated rain erosion for 40 hours. It is seen that no erosion is visible.
Annex B illustrates the result of a rain erosion test performed on a sample part of a protective cover for a wind turbine blade (Blade no. 1); said protective cover not being made of the polyurethane material according to the present invention. The test has been performed according to ASTM G73-10.
Annex B-3 illustrates the sample part before start of the test.
Annex B-4 illustrates the sample part when it has been exposed to the simulated rain erosion for 0.5 hours. It is seen that no erosion is visible.
Annex B-5 illustrates the sample part when it has been exposed to the simulated rain erosion for 1 hour. It is seen that severe erosion is visible.
Annex B-6 illustrates the sample part when it has been exposed to the simulated rain erosion for 5.0 hours. It is seen that severe erosion is visible.
AMENDED SHEET
1521601LO/MF ¨ amended spe:ificat ol (clean version) ¨ 30/11-2016 PCT/IB 2015/058 674 - 30.11.2016
16 Annex B-7 illustrates the sample part when it has been exposed to the simulated rain erosion for 11.5 hours at the end of the test. It is seen that severe erosion is visible.
Annex C illustrates the result of a rain erosion test performed on a sample part of a protective cover for a wind turbine blade (Blade no. 2); said protective cover not being made of the polyurethane material according to the present invention. The test has been performed according to ASTM G73-10.
Annex C-2 illustrates the sample part before start of the test.
Annex C-3 illustrates the sample part when it has been exposed to the simulated rain erosion for 5.0 hours. It is seen that severe erosion is visible.
Annex C-4 illustrates the sample part when it has been exposed to the simulated rain erosion for 10.0 hours. It is seen that severe erosion is visible.
Annex C-5 illustrates the sample part when it has been exposed to the simulated rain erosion for 21.0 hours at the end of the test. It is seen that severe erosion is visible.
Annex D illustrates the result of a rain erosion test performed on a sample part of a protective cover for a wind turbine blade (Blade no. 3); said protective cover not being made of the polyurethane material according to the present invention. The test has been performed according to ASTM G73-10.
Annex D-2 illustrates the sample part before start of the test.
Annex D-3 illustrates the sample part when it has been exposed to the simulated rain erosion for 0.5 hours. It is seen that severe erosion is visible.
Annex D-4 illustrates the sample part when it has been exposed to the simulated rain erosion for 1.5 hours. It is seen that severe erosion is visible.
Annex D-5 illustrates the sample part when it has been exposed to the simulated rain erosion for 3.5 hours at the end of the test. It is seen that severe erosion is visible.
Annex E-1 illustrates respective speeds during the tests performed.
Annex E-2 illustrates respective temperatures during the tests performed.
It is therefore seen that the durability of the polyurethane material according to the present invention is significantly higher than the other tested materials.
AMENDED SHEET
152160/LO/MF ¨ amended specification (clean version) ¨ 30/11-2016
Annex C illustrates the result of a rain erosion test performed on a sample part of a protective cover for a wind turbine blade (Blade no. 2); said protective cover not being made of the polyurethane material according to the present invention. The test has been performed according to ASTM G73-10.
Annex C-2 illustrates the sample part before start of the test.
Annex C-3 illustrates the sample part when it has been exposed to the simulated rain erosion for 5.0 hours. It is seen that severe erosion is visible.
Annex C-4 illustrates the sample part when it has been exposed to the simulated rain erosion for 10.0 hours. It is seen that severe erosion is visible.
Annex C-5 illustrates the sample part when it has been exposed to the simulated rain erosion for 21.0 hours at the end of the test. It is seen that severe erosion is visible.
Annex D illustrates the result of a rain erosion test performed on a sample part of a protective cover for a wind turbine blade (Blade no. 3); said protective cover not being made of the polyurethane material according to the present invention. The test has been performed according to ASTM G73-10.
Annex D-2 illustrates the sample part before start of the test.
Annex D-3 illustrates the sample part when it has been exposed to the simulated rain erosion for 0.5 hours. It is seen that severe erosion is visible.
Annex D-4 illustrates the sample part when it has been exposed to the simulated rain erosion for 1.5 hours. It is seen that severe erosion is visible.
Annex D-5 illustrates the sample part when it has been exposed to the simulated rain erosion for 3.5 hours at the end of the test. It is seen that severe erosion is visible.
Annex E-1 illustrates respective speeds during the tests performed.
Annex E-2 illustrates respective temperatures during the tests performed.
It is therefore seen that the durability of the polyurethane material according to the present invention is significantly higher than the other tested materials.
AMENDED SHEET
152160/LO/MF ¨ amended specification (clean version) ¨ 30/11-2016
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Claims (39)
1. A preformed protective cover (1) for a wind turbine blade (2), wherein the preformed protective cover is made of a polyurethane material prepared from a polyol, butanedi-ol, and an isocyanate, wherein the preformed protective cover is adapted to be at-tached along at least a part of a longitudinal edge (3) of the wind turbine blade by ad-hesion of an inside (4) of the preformed protective cover to a surface (5) of the longitu-dinal edge of the wind turbine blade, wherein the preformed protective cover is elon-gated in a longitudinal direction (D) and has an at least substantially U-formed cross-section, wherein the preformed protective cover includes a central cover section (6) extending in the longitudinal direction and two peripheral cover sections (7) extending in the longitudinal direction at either side of the central cover section (6), respectively, wherein the central cover section (6) has a minimum thickness of at least 1 millimetre, wherein each peripheral cover section (7) has a thickness decreasing from a maxi-mum thickness of at least 1 millimetre to a minimum thickness of less than 1/2 millime-tre.
2. A preformed protective cover according to claim 1, wherein the maximum thickness of each peripheral cover section corresponds to the minimum thickness of the central cover section.
3. A preformed protective cover according to claim 1 or 2, wherein the minimum thick-ness of the central cover section is at least 2 millimetres, preferably at least 3 millime-tres, more preferred at least 4 millimetres and most preferred approximately 5 millime-tres.
4. A preformed protective cover according to any one of claims 1 to 3, wherein the thickness of the central cover section is at least substantially constant from side to side of the central cover section.
5. A preformed protective cover according to any one of the claims 1 to 4, wherein the minimum thickness of each peripheral cover section is less than 1/3 millimetre, prefer-ably less than 1/5 millimetres, more preferred less than 1/7 millimetres and most pre-ferred approximately 1/10 millimetres.
6. A preformed protective cover according to any one of the claims 1 to 5, wherein each peripheral cover section has a thickness decreasing at least substantially con-stantly from its maximum thickness to its minimum thickness.
7. A preformed protective cover according to any one of the claims 1 to 6, wherein the width of each peripheral cover section is at least 3 per cent, preferably at least 7 per cent, more preferred at least 12 per cent and most preferred at least 15 per cent of the total width of the preformed protective cover.
8. A preformed protective cover according to any one of the claims 1 to 7, wherein the total width of the preformed protective cover is at least 30 millimetres, preferably at least 50 millimetres, more preferred at least 100 millimetres and most preferred ap-proximately 150 to 250 millimetres.
9. A preformed protective cover according to any one of the claims 1 to 8, wherein the total width of the preformed protective cover increases in the longitudinal direction.
10. A preformed protective cover according to any one of the claims 1 to 9, wherein the inside of the preformed protective cover is provided with a number of protrusions having a height of between 1/2 and 2 millimetres, preferably approximately 1 millime-tre.
11. A preformed protective cover according to any one of the claims 1 to 10, wherein the preformed protective cover has a symmetry axis extending in the longitudinal di-rection, and wherein the inside of the preformed protective cover at either side of the symmetry axis is provided with a number of spaced elongated protrusions extending with an oblique angle in relation to the longitudinal direction.
12. A preformed protective cover according to any one of the claims 1 to 11, wherein the isocyanate is an optionally modified diphenylmethane 4,4'-diisocyanate.
13. A preformed protective cover according to any one of the claims 1 to 12, wherein the butanediol is 1,4-butanediol.
14. A preformed protective cover according to any one of the claims 1 to 13, wherein the polyurethane comprises an UV stabilisator and/or colour pigment(s).
15. A preformed protective cover according to any one of the claims 1 to 14, wherein the polyol, butanediol, and isocyanate are used in a ratio by weight poly-ol:butanediol:isocyanate of 100:(3 to 5):(30 to 35).
16. A preformed protective cover according to any one of the claims 1 to 15, wherein the polyol, butanediol, and isocyanate are used in a ratio by weight poly-ol:butanediol:isocyanate of 100:4:32.3.
17. A preformed protective cover according to any one of the claims 1 to 16, wherein the polyol comprises an UV stabilisator and/or colour pigment(s).
18. A preformed protective cover according to any one of the claims 1 to 17, wherein butanediol is 1,4-butanediol.
19. A wind turbine blade including a preformed protective cover according to any one of the claims 1 to 18, wherein the preformed protective cover is attached along at least a part of a longitudinal edge of the wind turbine blade by adhesion to a surface of the longitudinal edge of the wind turbine blade.
20. A wind turbine blade according to claim 19, wherein the wind turbine blade in-cludes a first blade shell and a second blade shell joined together to form a wind tur-bine blade along a first longitudinal joint at a leading edge of the wind turbine blade and along a second longitudinal joint at a trailing edge of the wind turbine blade, and wherein the preformed protective cover is attached at least approximately symmetrical about the first or second longitudinal joint, and preferably about the first longitudinal joint.
21. A method of providing a wind turbine blade with a preformed protective cover ac-cording to any one of the claims 1 to 18, whereby the preformed protective cover is prepared by a) mixing a polyol and butanediol, b) tempering and degassing the mixture according to a), c) tempering and degassing an isocyanate, d) pumping the degassed mixture according to b) and the degasses isocyanate ac-cording to c) through a mixing head into a mould, e) curing in the mould, and f) demoulding the cured item, whereby the preformed protective cover is attached along at least a part of a longitudi-nal edge of the wind turbine blade by adhesion of the inside of the preformed protec-tive cover to a surface of the longitudinal edge of the wind turbine blade, whereby the adhesion is performed by the following steps:
.cndot. providing an adhesive, such as a two component polyurethane adhesive, on the inside of the preformed protective cover, .cndot. pressing the inside of the preformed protective cover against the surface of the longitudinal edge of the wind turbine blade, and .cndot. removing excess adhesive leaking between each peripheral cover section and the surface of the longitudinal edge of the wind turbine blade.
.cndot. providing an adhesive, such as a two component polyurethane adhesive, on the inside of the preformed protective cover, .cndot. pressing the inside of the preformed protective cover against the surface of the longitudinal edge of the wind turbine blade, and .cndot. removing excess adhesive leaking between each peripheral cover section and the surface of the longitudinal edge of the wind turbine blade.
22. A method according to claim 21, whereby the adhesive is provided as string of adhesive on the inside of the preformed protective cover at least substantially along a longitudinal symmetry axis of the preformed protective cover.
23. A method according to claim 21 or 22, whereby the preformed protective cover is produced by the following steps:
.cndot. providing a male form part having a geometry resembling or at least substan-tially matching the outer geometry of the at least part of the longitudinal edge of the wind turbine blade, .cndot. providing a female form part having a geometry matching the male form part, but being slightly larger, .cndot. closing the male form part against the female form part thereby forming a form cavity, .cndot. pouring the adhesive into the form cavity, and .cndot. opening the form cavity by separating the male form part from the female form part and ejecting the moulded preformed protective cover
.cndot. providing a male form part having a geometry resembling or at least substan-tially matching the outer geometry of the at least part of the longitudinal edge of the wind turbine blade, .cndot. providing a female form part having a geometry matching the male form part, but being slightly larger, .cndot. closing the male form part against the female form part thereby forming a form cavity, .cndot. pouring the adhesive into the form cavity, and .cndot. opening the form cavity by separating the male form part from the female form part and ejecting the moulded preformed protective cover
24. A method according to any one of the claims 21 to 23, whereby the wind turbine blade is provided with the preformed protective cover as a repair operation, whereby an area of said surface of the longitudinal edge of the wind turbine blade correspond-ing to the preformed protective cover is machined, such as by grinding or milling, be-fore attachment of the preformed protective cover.
25. A method according to any one of the claims 21 to 24, whereby the wind turbine blade is provided with the preformed protective cover when the wind turbine blade is still mounted on a wind turbine.
26. A method according to any one of the claims 21 to 25, whereby the tempering ac-cording to b) and/or c) is carried out at a temperature from 30°C to 50°C.
27. A method according to any one of the claims 21 to 26, whereby the tempering ac-cording to b) and/or c) is carried out at a temperature about 40°C.
28. A method according to any one of the claims 21 to 27, whereby the mould in step d) is preheated.
29. A method according to claim 28, whereby the mould in step d) is preheated to a temperature from 90°C to 120°C.
30. A method according to claim 29, whereby the mould in step d) is preheated to a temperature about 100°C.
31. A method according to any one of the claims 21 to 30, whereby the curing in step e) is carried out at a temperature from 90°C to 120°C.
32. A method according to claim 31, whereby the curing in step e) is carried out at a temperature of about 100°C.
33. A method according to any one of the claims 21 to 32, whereby the curing in step e) is carried out for about 15 minutes.
34. A method according to any one of the claims 21 to 33, comprising a further step:
g) post-curing.
g) post-curing.
35. A method according to claim 34, whereby the post-curing in step g) takes place in about 12 hours at a temperature of about 100°C.
36. A method according to any one of the claims 21 to 35, whereby the polyol, butane-diol, and isocyanate are used in a ratio by weight polyol:butanediol:isocyanate of 100:(3 to 5):(30 to 35).
37. A method according to any one of the claims 21 to 36, whereby the polyol, butane-diol, and isocyanate are used in a ratio by weight polyol:butanediol:isocyanate of 100:4:32.3.
38. A method according to any one of the claims 21 to 37, whereby the polyol com-prises an UV stabilisator and/or colour pigment(s).
39. A method according to any one of the claims 21 to 38, whereby butanediol is 1,4-butanediol.
Applications Claiming Priority (5)
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| DKPA201400650 | 2014-11-10 | ||
| DKPA201400650 | 2014-11-10 | ||
| DKPA201500208 | 2015-04-01 | ||
| DKPA201500208 | 2015-04-01 | ||
| PCT/IB2015/058674 WO2016075619A1 (en) | 2014-11-10 | 2015-11-10 | Polyurethane material, process for preparing such material and protective cover for wind turbine blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2966685A1 true CA2966685A1 (en) | 2016-05-19 |
| CA2966685C CA2966685C (en) | 2021-01-12 |
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| CA2966685A Active CA2966685C (en) | 2014-11-10 | 2015-11-10 | Polyurethane material, process for preparing such material and protective cover for wind turbine blade |
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| US (1) | US11629689B2 (en) |
| EP (2) | EP3533816B1 (en) |
| JP (1) | JP2018503775A (en) |
| CN (2) | CN117964874A (en) |
| AU (1) | AU2015344705B2 (en) |
| BR (1) | BR112017009645B1 (en) |
| CA (1) | CA2966685C (en) |
| DK (2) | DK3533816T3 (en) |
| ES (1) | ES2726023T3 (en) |
| WO (1) | WO2016075619A1 (en) |
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- 2015-11-10 AU AU2015344705A patent/AU2015344705B2/en active Active
- 2015-11-10 DK DK19164579.5T patent/DK3533816T3/en active
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- 2015-11-10 JP JP2017544061A patent/JP2018503775A/en active Pending
- 2015-11-10 BR BR112017009645-5A patent/BR112017009645B1/en active IP Right Grant
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Also Published As
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|---|---|
| CA2966685C (en) | 2021-01-12 |
| EP3533816A1 (en) | 2019-09-04 |
| CN107207688A (en) | 2017-09-26 |
| EP3218597A1 (en) | 2017-09-20 |
| DK3218597T3 (en) | 2019-06-03 |
| US11629689B2 (en) | 2023-04-18 |
| WO2016075619A1 (en) | 2016-05-19 |
| AU2015344705A1 (en) | 2017-05-25 |
| US20170314532A1 (en) | 2017-11-02 |
| EP3533816B1 (en) | 2024-07-17 |
| AU2015344705B2 (en) | 2018-08-23 |
| BR112017009645A2 (en) | 2017-12-19 |
| BR112017009645B1 (en) | 2022-09-27 |
| DK3533816T3 (en) | 2024-08-19 |
| JP2018503775A (en) | 2018-02-08 |
| CN117964874A (en) | 2024-05-03 |
| EP3218597B1 (en) | 2019-03-27 |
| ES2726023T3 (en) | 2019-10-01 |
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